Point P1 till P3 is 3 of circle. 4 So the magnitude of this angle is 2700
. form a straight line. 4 so the magnitude of this angle is 900 Point P1 and P3 is 1 of circle.
P2
P3
P1
P4
Point P1 till P1 again is a circle has 3600 Point P1 and P2 is 1 of circle. 2 So the magnitude of this angle is 1800 .The unit that is commonly used to measure angels is .

cosecant. secant.A trigonometric function is a ratio of certain parts of a triangle. Let us look at this triangle«
B c a A C b Cos Tan
Sin =
Side Opposite Hypothenuse Side Adjacent = Hypothenuse Side Opposite = Side Adjacent
= = =
a c b c a b
The Cosecant is the inversion of the sine : Cosecant = Hypothenuse Side Opposite The Secant is the inversion of the cosine : Secant = Hypothenuse Side Adjacent The Cotangent is the inversion of the tangent : Cotangent = Side Adjacent Side Opposite
. tangent. The names of these ratios are: The sine. cosine. cotangent.

When solving oblique triangles.
. You need«
B
a b c ! ! sin A sin B sin C
c a A C b
a2=b2+c2-2bc cosA b2=a2+c2-2ac cosB c2=a2+b2-2ab cosC
It is useful to memorize these laws. They can be used to solve any triangle if enough measurements are given.

.

In the following few slides.Trigonometric identities are ratios and relationships between certain trigonometric functions. you will learn about different trigonometric identities that take place in each trigonometric function.
.

If you look at the name of cosine. Sine60º=Cosine30º Secant60º=Cosecant30º tangent30º=cotangent60º
.866. The cotangent is the cofunction of the tangent (co-tangent). you can actually see that it is the cofunction of the sine (co-sine).866. and the cosecant is the cofunction of the secant (co-secant). What is the cosine of 30º? 0.What is the sine of 60º? 0.